If you’re entitled to acquire Aadhaar amount, you may, on or after July 1, 2017, estimate Aadhaar amount from the application form for allotment of permanent account number and on your return of revenue.
If you do not file income tax return however have both PAN and Aadhaar then joining both is compulsory otherwise your PAN will be apt to eventually become invalid in a date to be notified by the government, according to section 139AA of this Act.
Finance minister Arun Jaitley via an amendment to tax proposals in the Finance Bill to get 2017-18 had created Aadhaar compulsory for reporting income tax returns and also supplied for joining of PAN using Aadhaar to examine tax evasion through usage of several PAN cards.
Combine it if you do not need to lose your own PAN
If somebody doesn’t associate PAN and Aadhaar as mandated by department 139AA then the individual’s PAN would eventually become invalid. If a individual’s PAN gets invalid they’d face issues in most banking / financial trades demanding PAN to be quoted.